Robert Joseph Plomin CBE FBA (born 1948) is an American/British psychologist and geneticist best known for his work in behavior genetics.

A Review of General Psychology survey, published in 2002, ranked Plomin as the 71st most cited psychologist of the 20th century.

[2] He graduated high school from DePaul University Academy in Chicago, he then earned a B.A.

[4] Plomin was appointed Commander of the Order of the British Empire (CBE) in the 2023 New Year Honours for services to scientific research.

[9] As of 2000, Plomin conducted the Twins Early Development Study of all twins born in England from 1994 to 1996, focusing on developmental delays in early childhood, their association with behavioural problems and educational attainment.